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The uterus is a hollow, muscular organ located in the female pelvis between the bladder and rectum. It is the site of menstruation and the development of an embryo and fetus during pregnancy. The uterus contains smooth muscle, which contracts and aids in the birth of a baby.
| Characteristics | Values |
|---|---|
| Contains muscle | Yes |
| Type of muscle | Smooth muscle |
| Muscle layer | Myometrium |
| Muscle cell type | Uterine smooth muscle cells (uterine myocytes) |
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What You'll Learn
The uterus is a hollow muscular organ located in the female pelvis
The uterus has three tissue layers. The endometrium is the inner lining, consisting of the functional (superficial) and basal endometrium. The functional layer responds to reproductive hormones, and when it sheds, it results in menstrual bleeding. The myometrium is the middle layer of the uterine wall, consisting mainly of uterine smooth muscle cells (also called uterine myocytes) but also of supporting stromal and vascular tissue. Its main function is to induce uterine contractions. The myometrium is located between the endometrium and the serosa or perimetrium (the outer uterine layer). The outer, more predominant layer of the myometrium is the major contractile tissue during parturition and abortion. The long axis of the cervix is rarely in line with the long axis of the body of the uterus. Commonly, the body of the uterus is tilted forward over the long axis of the cervix, which is called anteflexion of the uterus.
The main function of the uterus is to nourish the developing fetus prior to birth. The uterus is the site of menstruation, a 28-day hormone-controlled cycle in which the uterine lining proliferates to prepare for the implantation of a fertilized ovum and subsequently sheds if fertilization does not occur. Additionally, the smooth muscle in the uterus contracts and aids in the birth of a baby.
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The uterus has three tissue layers
The uterus is a muscular, hollow organ located in the female pelvis between the bladder and rectum. It is approximately 5 cm wide, 8 cm long, and 4 cm thick with a volume of 80 to 200 mL. The uterus has three tissue layers: the endometrium, the myometrium, and the serosa/perimetrium.
The endometrium is the inner lining of the uterus. It consists of a thin base layer (stratum basalis) and a thicker functional layer (stratum functionalis). The functional layer responds to reproductive hormones, proliferating to prepare for the implantation of a fertilised ovum and shedding if fertilisation does not occur, resulting in menstrual bleeding.
The myometrium is the middle layer of the uterine wall, consisting mainly of uterine smooth muscle cells (uterine myocytes) and supporting stromal and vascular tissue. Its main function is to induce uterine contractions, which aid in the birth of a baby. During pregnancy, cells of this layer undergo hypertrophy and hyperplasia in preparation to expel the fetus at birth.
The serosa/perimetrium is the thin outer layer of the uterus, composed of epithelial cells. The long axis of the cervix is rarely in line with the long axis of the body of the uterus. Commonly, the long axis of the body of the uterus is tilted forward over the long axis of the cervix, which is called anteflexion of the uterus.
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The myometrium is the middle layer of the uterine wall
The uterus is a muscular, hollow organ in the female pelvis. It is approximately 5 cm wide, 8 cm long, and 4 cm thick with a volume of 80 to 200 mL. The uterus contains smooth muscle, which contracts and aids in the birth of a baby.
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The myometrium consists of smooth muscle cells
The uterus is a hollow, muscular organ located in the female pelvis between the bladder and rectum. It is approximately 5 cm wide, 8 cm long, and 4 cm thick with a volume of 80 to 200 mL. The uterus has three tissue layers: the endometrium, the myometrium, and the serosa/perimetrium.
The myometrium is the middle layer of the uterine wall, consisting mainly of uterine smooth muscle cells (also called uterine myocytes). It is located between the endometrium (the inner layer of the uterine wall) and the serosa or perimetrium (the outer uterine layer). The myometrium is composed of an inner circular and outer longitudinal smooth muscle layer with a vascular layer between them. The myometrium's main function is to induce uterine contractions, which aid in the birth of a baby.
The inner one-third of the myometrium (the junctional or sub-endometrial layer) is derived from the Müllerian duct, while the outer layer appears to originate from non-Müllerian tissue. The outer layer is the major contractile tissue during parturition and abortion.
The myometrium is an example of smooth muscle, which is also found in the gastrointestinal tract, urological tract, and blood vessels. All of these tissues have the ability to generate contractions autonomously.
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The uterus contracts and aids in the birth of a baby
The uterus is a hollow, muscular organ located in the female pelvis between the bladder and rectum. It is approximately 5 cm wide, 8 cm long, and 4 cm thick with a volume of 80 to 200 mL. The uterus contains smooth muscle, which contracts and aids in the birth of a baby.
The uterus has three tissue layers: the endometrium, the myometrium, and the serosa/perimetrium. The myometrium is the middle layer of the uterine wall, consisting mainly of uterine smooth muscle cells. Its main function is to induce uterine contractions. The myometrium is located between the endometrium (the inner layer of the uterine wall) and the serosa or perimetrium (the outer uterine layer). The outer layer of the myometrium is the major contractile tissue during parturition and abortion.
The uterus is the site of menstruation, a 28-day hormone-controlled cycle in which the uterine lining proliferates to prepare for the implantation of a fertilized ovum and subsequently sheds if fertilization does not occur. During menstruation, the functional layer of the endometrium sheds, resulting in menstrual bleeding.
The main function of the uterus is to nourish the developing fetus prior to birth. The uterus contracts during labour, aiding in the birth of a baby. These contractions are induced by the uterine smooth muscle cells in the myometrium.
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Frequently asked questions
Yes, the uterus is a muscular, hollow organ.
The uterus contains smooth muscle.
The muscle in the uterus contracts and aids in the birth of a baby.
The muscle layer in the uterus is called the myometrium.
The myometrium induces uterine contractions.
